Proxifier - Proxifier extends the advantages of a proxy server to network applications that don't natively support it.
Surge for Mac - Advanced Web Debugging Proxy for Mac & iOS
Proxycap - ProxyCap empowers you to divert your PC’s system associations through intermediary servers.
Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Wide Cap - WideCap - is system proxifier. It was created as `extended` version of FreeCap program.
HTTP Headers - HTTP Headers allows you to quickly see the HTTP header information for the current URL.